Porter, P. W. (1956). Population distribution and land use in Liberia. University of London.
Lua i Stíl Chicago (17ú heag.)Porter, Philip Wayland. Population Distribution and Land Use in Liberia. University of London, 1956.
Lua MLA (8ú heag.)Porter, Philip Wayland. Population Distribution and Land Use in Liberia. University of London, 1956.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.